<template>

  <div class="app-container">

    <h2 style="text-align: center;">发布新课程</h2>

    <el-steps :active="2" process-status="wait" align-center style="margin-bottom: 40px;">
      <el-step title="填写课程基本信息"/>
      <el-step title="创建课程大纲"/>
      <el-step title="提交审核"/>
    </el-steps>

    <el-button type="text" @click="openSaveChapterDialog">添加章节</el-button>
    <!-- 添加和修改章节表单 -->
    <el-dialog :visible.sync="dialogChapterFormVisible" title="添加章节">
        <el-form :model="chapter" label-width="120px">
            <el-form-item label="章节标题">
                <el-input v-model="chapter.title"/>
            </el-form-item>
            <el-form-item label="章节排序">
                <el-input-number v-model="chapter.sort" :min="0" controls-position="right"/>
            </el-form-item>
        </el-form>
        <div slot="footer" class="dialog-footer">
            <el-button @click="dialogChapterFormVisible = false">取 消</el-button>
            <el-button type="primary" @click="saveOrUpdate">确 定</el-button>
        </div>
    </el-dialog>

    <!-- 添加和修改课时表单 -->
    <el-dialog :visible.sync="dialogVideoFormVisible" title="添加课时">
      <el-form :model="video" label-width="120px">
        <el-form-item label="课时标题">
          <el-input v-model="video.title"/>
        </el-form-item>
        <el-form-item label="课时排序">
          <el-input-number v-model="video.sort" :min="0" controls-position="right"/>
        </el-form-item>
        <el-form-item label="是否免费">
          <el-radio-group v-model="video.free">
            <el-radio :label="true">免费</el-radio>
            <el-radio :label="false">默认</el-radio>
          </el-radio-group>
        </el-form-item>
        <el-form-item label="上传视频">
          <el-upload
                :on-success="handleVodUploadSuccess"
                :on-remove="handleVodRemove"
                :on-error="handleVodUploadError"
                :before-remove="beforeVodRemove"
                :on-exceed="handleUploadExceed"
                :file-list="fileList"
                :action="BASE_API+'/eduvod/vod/upload'"
                :limit="1"
                class="upload-demo">
          <el-button size="small" type="primary" >上传视频</el-button>
          <el-tooltip placement="right-end">
              <div slot="content">最大支持1G，<br>
                  支持3GP、ASF、AVI、DAT、DV、FLV、F4V、<br>
                  GIF、M2T、M4V、MJ2、MJPEG、MKV、MOV、MP4、<br>
                  MPE、MPG、MPEG、MTS、OGG、QT、RM、RMVB、<br>
                  SWF、TS、VOB、WMV、WEBM 等视频格式上传</div>
              <i class="el-icon-question"/>
          </el-tooltip>
          </el-upload>
        </el-form-item>
      </el-form>
      <div slot="footer" class="dialog-footer">
        <el-button @click="dialogVideoFormVisible = false">取 消</el-button>
        <el-button :disabled="saveVideoBtnDisabled" type="primary" @click="saveOrUpdateVideo">确 定</el-button>
      </div>
    </el-dialog>

    <!-- 章节 -->
    <ul class="chanpterList">
        <li
            v-for="chapter in chapterVideoList"
            :key="chapter.id">
            <p>
                {{ chapter.title }}
                <span class="acts">
                  <el-button type="text" @click="dialogVideoFormVisible = true; chapterId = chapter.id">添加课时</el-button>
                  <el-button type="text" @click="openUpdateDialog(chapter.id)">编辑</el-button>
                  <el-button type="text" @click="deleteChapter(chapter.id)">删除</el-button>
                </span>
            </p>
            
            <!-- 视频 -->
            <ul class="chanpterList videoList">
                <li
                    v-for="video in chapter.children"
                    :key="video.id">
                    <p>
                      {{ video.title }}
                      <span class="acts">
                        <el-button type="text" @click="openVideoDialog(video.id)">编辑</el-button>
                        <el-button type="text" @click="deleteVideo(video.id)">删除</el-button>
                      </span>
                    </p>
                    
                </li>
            </ul>
        </li>
    </ul>

        <el-button @click="previous">上一步</el-button>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="next">下一步</el-button>

  </div>
</template>

<script>
import course from '@/api/edu/course'
import chapter from '@/api/edu/chapter'
import video from '@/api/edu/video'
export default {
  data() {
    return {
      saveBtnDisabled: false, // 保存按钮是否禁用
      saveVideoBtnDisabled: false, // 课时按钮是否禁用
      courseId:'',//课程id
      chapterId: '', // 课时所在的章节id
      video: {    // 课时对象
        title: '',
        sort: 0,
        free: 0,
        videoSourceId: '',
        videoOriginalName:''
      },
      chapterVideoList: [], // 章节嵌套课时列表
      dialogChapterFormVisible: false, //是否显示章节表单
      dialogVideoFormVisible: false,//是否显示小节表单
      chapter: {// 章节对象
        title: '',
        sort: 0
      },
      fileList: [],//上传文件列表
      BASE_API: process.env.BASE_API // 接口API地址
    }
  },

  created() {
    console.log('chapter created')
    if(this.$route.params && this.$route.params.id){
      this.courseId=this.$route.params.id
    }
    this.getChapterOrVideo()
  },

  methods: {
//==================================小节操作================================================

    //上传视频
    //成功回调
    handleVodUploadSuccess(response, file, fileList) {
      this.video.videoSourceId = response.data.videoId
      this.video.videoOriginalName=file.name    
    },
    //失败回调
    handleVodUploadError(err,file,fileList){
      this.$message({
        type: 'info',
        message: '上传失败，请重新上传!'
      })
      this.fileList=[]
    },
    //视图上传多于一个视频
    handleUploadExceed(files, fileList) {
      this.$message.warning('想要重新上传视频，请先删除已上传的视频')
    },
    //点*的时候
    beforeVodRemove(file, fileList){
         return this.$confirm(`确定移除 ${file.name}？`)
    },
    //点确定删除后执行
    handleVodRemove(){
      video.removeById(this.video.videoSourceId).then(response=>{
        this.$message({
          type: 'success',
          message: response.message
        })
        this.fileList=[]
        this.video.videoSourceId=''
        this.video.videoOriginalName=''
      })
    },
      
    //删除小节
    deleteVideo(videoId){
      this.$confirm('此操作将永久删除该小节记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        video.deleteById(videoId).then(res=>{
          this.$message({
          type: 'success',
          message: '删除成功!'
          });
          //更新页面
          this.getChapterOrVideo()
        })        
      })
    },
    
    //添加小节
    saveDataVideo() {
      this.video.courseId = this.courseId
      this.video.chapterId = this.chapterId
      video.save(this.video).then(res => {
        this.$message({
          type: 'success',
          message: '保存成功!'
        })
        this.helpSaveVideo()
        this.fileList=[]
      })
    },

    //修改小节打开对话框
    openVideoDialog(videoId) {
      video.getById(videoId).then(res => {
        this.video = res.data.video
        this.dialogVideoFormVisible = true
      })
    },

    //修改小节信息
    updateDataVideo() {
      video.update(this.video).then(res => {
        this.$message({
          type: 'success',
          message: '修改成功!'
        })
        this.helpSaveVideo() 
      })
    },

    //判断是保存还是更新
    saveOrUpdateVideo() {
      this.saveVideoBtnDisabled = true
      if (!this.video.id) {
        this.saveDataVideo()
      } else {
        this.updateDataVideo()
      }
    },

    //保存成功后做的
    helpSaveVideo() {
      this.dialogVideoFormVisible = false// 如果保存成功则关闭对话框
      this.getChapterOrVideo()// 刷新列表
      this.video.title = ''// 重置章节标题
      this.video.sort = 0// 重置章节标题
      this.video.videoSourceId = ''// 重置视频资源id
      this.saveVideoBtnDisabled = false
    },


//==================================章节操作================================================
    //删除章节
    deleteChapter(chapterId){
      this.$confirm('此操作将永久删除该章节记录, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).then(() => {
        chapter.removeById(chapterId).then(res=>{
          this.$message({
          type: 'success',
          message: '删除成功!'
          });
          //更新页面
          this.getChapterOrVideo()
        })        
      })
    },
    //判断是添加还是修改
    saveOrUpdate(){
      if(!this.chapter.id){
        this.saveChapter()
      }else{
        this.updateChapter()
      }
    },
    ////获取章节数据回显进行修改
    openUpdateDialog(chapterId){ 
      //根据id获取数据
      chapter.getById(chapterId).then(res=>{
        //回显
        this.chapter=res.data.chapter
        this.dialogChapterFormVisible=true
      })
    },
    //修改章节信息
    updateChapter(){
      chapter.update(this.chapter).then(res=>{      
        //提示信息
        this.$message({
            type: 'success',
            message: '修改章节信息成功!'
          })
        //关闭对话框  
        this.dialogChapterFormVisible=false
        //更新页面
        this.getChapterOrVideo()
      })
    },

    //添加章节
    saveChapter(){
      //给属性courseId赋值
      this.chapter.courseId=this.courseId
      chapter.save(this.chapter).then(res=>{
        //关闭对话框
        this.dialogChapterFormVisible=false
        //提示信息
        this.$message({
            type: 'success',
            message: '添加章节成功!'
          })
        //更新页面
        this.getChapterOrVideo()
      })
    },
    //打开对话框
    openSaveChapterDialog(){
      this.dialogChapterFormVisible=true
      this.chapter={}
    },
    //根据课程id获取章节和小结
    getChapterOrVideo(){
      course.getChapterOrVideo(this.courseId).then(res=>{
        this.chapterVideoList=res.data.list
      })
    },
    previous() {
      console.log('previous')
      this.$router.push({ path: '/course/info/'+this.courseId })
    },

    next() {
      console.log('next')
      this.$router.push({ path: '/course/publish/'+this.courseId })
    }
  }
}
</script>

<style scoped>
.chanpterList{
    position: relative;
    list-style: none;
    margin: 0;
    padding: 0;
}
.chanpterList li{
  position: relative;
}
.chanpterList p{
  float: left;
  font-size: 20px;
  margin: 10px 0;
  padding: 10px;
  height: 70px;
  line-height: 50px;
  width: 100%;
  border: 1px solid #DDD;
}
.chanpterList .acts {
    float: right;
    font-size: 14px;
}

.videoList{
  padding-left: 50px;
}
.videoList p{
  float: left;
  font-size: 14px;
  margin: 10px 0;
  padding: 10px;
  height: 50px;
  line-height: 30px;
  width: 100%;
  border: 1px dotted #DDD;
}
</style>